Page last updated at 15:57 GMT, Thursday, 3 February 2011

US cyber warfare expert on threats which exist now

John Bumgarner, research director for security technology at the US Cyber Consequences Unit, talks to Newsnight's Susan Watts about the kind of cyber attack capabilities which already exist.

Watch Susan Watts' full report on the threat posed by cyber warfare on Newsnight on Thursday 3 February 2011 at 10.30pm on BBC Two, then afterwards on the BBC iPlayer and Newsnight website.

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